(19)
(11) EP 0 169 690 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.05.1987 Bulletin 1987/20

(43) Date of publication A2:
29.01.1986 Bulletin 1986/05

(21) Application number: 85304972

(22) Date of filing: 11.07.1985
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 19.07.1984 US 632250

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
 ()

(72) Inventor:
  • Sweeny, Wilfred
     ()

   


(54) Cyclization of acrylic fiber


(57) improved process for producing a carbon fiber having high tensile stength and high modulus involves oxidation of acrylonitrile fiber which has been treated with selected ammonium salts.






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